spring-cloud-starter-alibaba-nacos-discovery在maven中找不到的问题以及解决方法

 <dependency>
     <groupId>***.alibaba.cloud</groupId>
     <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
 </dependency>

项目中pom.xml直接用这个maven会报
Could not find artifact ***.alibaba.cloud:spring-cloud-starter-alibaba-nacos-discovery:pom:unknown in aliyun-public (https://maven.aliyun.***/repository/public)

试了几种方法包括：

1. 指定版本为1.4.1
2. 在.m2/settings.xml里添加新的阿里云源
3. Invalid cache重启
4. maven clean

发现都没用。最终解决方法是在pom的dependencyManagement添加

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>***.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

${spring-cloud-alibaba.version} 要根据对应的springboot版本来选。详见springcloud alibaba 版本说明